US4265587A - Quick-coupling locking mechanism - Google Patents
Quick-coupling locking mechanism Download PDFInfo
- Publication number
- US4265587A US4265587A US06/060,267 US6026779A US4265587A US 4265587 A US4265587 A US 4265587A US 6026779 A US6026779 A US 6026779A US 4265587 A US4265587 A US 4265587A
- Authority
- US
- United States
- Prior art keywords
- lifting
- holding
- bar
- hook
- link
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/3604—Devices to connect tools to arms, booms or the like
- E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
- E02F3/3618—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat with two separating hooks
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/3604—Devices to connect tools to arms, booms or the like
- E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
- E02F3/3663—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat hydraulically-operated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
- Y10T74/20588—Levers toggle
Definitions
- the present invention relates generally to an apparatus for attaching an implement to a vehicle and particularly to an automatic quick-coupling locking mechanism for attaching a service module to a mining service vehicle.
- Sliding-pin hitch assemblies have a number of significant deficiencies.
- a major disadvantage of such assemblies is that extremely accurate alignment of the sliding pins and the receiving slots of the implement is required for proper operation of the connecting mechanism.
- the pins are the load-carrying member of the hitch assembly and because the vehicles are exposed to heavy duty service, either the pins or receiving slots of the implement become bent or damaged.
- manual engagement of the hitch assembly and the implement is often required, causing substantial inconvenience and loss of time, to say nothing of the safety hazards presented by such practices.
- the need for proper alignment of the hitch assembly and the service implement further requires that both the service vehicle and implement be located on smooth terrain. Rough terrain prevents proper alignment.
- Another disadvantage of sliding-pin assemblies is that the load of the service implement is carried indirectly by the hydraulic system utilized to activate the pins. Thus, a failure of the hydraulic system results in the disengagement of the implement.
- hitch assembly In another type of hitch assembly, a pair of horizontal bars attached to a hydraulically operated lifting boom are brought into contact with a bracket attached to an implement. A hydraulic cylinder mounted generally vertically between the two horizontal hitching bars operates to force the bars apart from one another and into engagement with a pair of receiving mounts formed as part of the bracket. Hitching assemblies of this type are also dependent on a hydraulic system for secure attachment of the implement to the vehicle. A leak or failure in the hydraulic system causes the hitch assembly to become inoperative and could result in serious accident or injury. This type of system also requires a lifting boom which carries the load of the implement at a distance from the front axle of the vehicle. This presents a counterbalancing problem for low machines of the type required for underground mining.
- An object and advantage of the present invention is the provision of an automatic quick-coupling locking mechanism for attaching a service module to a mining service vehicle.
- a further object and advantage of the present invention is the provision of a mining service vehicle having a standardized quick-coupling locking mechanism for attaching an unlimited variety of service modules to the service vehicle.
- a further object and advantage of the present invention is the provision of an automatic quick-coupling locking mechanism for attaching a service module to a mining service vehicle even though the module and the vehicle may be askew.
- a further object and advantage of the present invention is the provision of an automatic quick-coupling locking mechanism for securely attaching a service module to a mining service vehicle even in the event of hydraulic failure in the mechanism.
- a still further object and advantage of the present invention is the provision of an automatic quick-coupling locking mechanism which lifts and locks a service module to a mining service vehicle in a fixed carry position in one actuation such that the load of the service module is carried relatively close to the front axle of the service vehicle.
- FIG. 1 is a side view of a mining service vehicle, service module and locking mechanism showing the approach of the service vehicle to the service module;
- FIG. 2 is a side view of a mining service vehicle, service module and locking mechanism showing contact between the lifting bar 5 and the attachment means 2;
- FIG. 3 is a side view of a mining service vehicle, service module and locking mechanism showing the secure engagement of the lifting bar 5 and the holding bar 6 with the lifting hook 3 and the holding hook 4, respectively;
- FIG. 4 is a side view showing a detailed arrangement of the locking mechanism in the disengaged position
- FIG. 5 is a side view showing a detailed arrangement of the locking mechanism in the engaged position.
- FIG. 6 is a plan view showing the locking mechanism in the engaged position.
- the automatic quick-coupling locking mechanism of the present invention generally comprises a linkage assembly A rigidly secured to a service vehicle B, preferably a mining service vehicle, and a generally C-shaped attachment means 2 rigidly secured to a service module C. While the service module C is illustrated as a load-carrying implement, it should be understood that the module can be any type of tool or service device.
- the C-shaped attachment means 2 is formed to define a downwardly concave lifting hook 3 at its top and an upwardly concave holding hook 4 at its bottom.
- the attachment means comprises two brackets 2 (shown in hidden lines in FIG. 6) mounted at the rear end of the service module C to extend outwardly therefrom. Each of the brackets 2 is formed to define a lifting hook 3 at its top and a holding hook 4 at its bottom.
- the attachment means 2 may be secured to the service module C by bolts, welds or other suitable means or may be formed as an integral part of the service module.
- attachment means 2 could be a single member extending horizontally across the rear end of the service module C and having lifting and holding hooks formed over all or a part of its width.
- the linkage assembly A which is described in detail hereinbelow, includes a horizontal lifting bar 5 for engagement with the lifting hook 3 and a horizontal holding bar 6 for engagement with the holding hook 4.
- FIGS. 1-3 illustrate generally the operation of the locking mechanism of the present invention.
- FIG. 1 shows the service vehicle B approaching the service module C.
- FIG. 2 shows the lifting bar 5 making contact with the attachment means 2 at a point between the lifting hook 3 and the holding hook 4.
- the linkage assembly A is activated as described in detail hereinbelow to move the lifting bar 5 generally upwardly into secure engagement with the lifting hook 3.
- Further upward movement of the lifting bar 5 after its engagement with the lifting hook 3 causes the service module C to be lifted at its rear end in a generally pivotal movement about the lower front end of the service module C and to be drawn toward the service vehicle B until the attachment means 2 makes contact with the holding bar 6.
- lifting bar 5 raises the service module C until holding hook 4 achieves engagement with the holding bar 6. Then, as described in detail below, further movement of lifting bar 5 causes service module C to be securely locked to vehicle B in a fixed, relative carry position shown in FIG. 3.
- FIGS. 4-6 show the linkage assembly A in detail.
- a toggle link 9 and a lifting bar link 10 are pivotally connected to a extension 11 of the frame of the service vehicle by pivot pins 7 and 8, respectively.
- a connecting link 14 is connected to the toggle link 9 and the lifting bar link 10 by pivot pins 12 and 13, respectively, to form a lockable toggle linkage.
- Horizontal lifting bar 5 is mounted at the distal end of the lifting bar link 10.
- a selectively extensible reciprocal actuator means 17, illustrated as a hydraulic cylinder is connected to the frame extension 11 and the connecting link 14 by pivot pins 15 and 16, respectively.
- actuator means 17 is selectively operable to forceably move the toggle linkage comprising links 9 and 14 from the open position shown in FIG. 4 to the locked position shown in FIG. 5 and vice versa.
- a holding bar link 18 having horizontal holding bar 6 mounted at its distal end is pivotally attached to the frame extension 11 by pin 19.
- the holding bar link 18 is restrained and guided by a stop stirrup 20 which is illustrated as being integral with the frame extension 11.
- a separating or biasing means 21 such as encapsulated prestressed rubber or steel springs, which when engaged by the holding bar link 18 provides a separating force between the holding bar link 18 and the lifting bar link 10 and, thus, between the lifting bar 5 and the holding bar 6.
- actuator means 17 causes the lifting bar link 10 to move generally upwardly in a vertical arc and, thus, causes the distal end of the lifting bar link 10 to rotate upwardly in a counterclockwise direction around pivot pin 8.
- horizontal lifitng bar 5 is moved upwardly into secure engagement with the downwardly concave lifting hook 3.
- the service module is lifted at its rear end as described hereinabove and is drawn toward the service vehicle.
- holding bar 6 makes contact with attachment means 2 and is brought into secure engagement with holding hook 4 as the service module C is lifted upwardly.
- a target tab 22 is mounted integrally on the service module C. From the position of the target tab 22, the operator can judge the relative position of the pivot pin 16 and thus of the linkage assembly with respect to the attachment means 2. If, when first contact between the lifting bar 5 and the attachment means 2 is made, the service module C is askew, the operator merely utilizes the service vehicle B to push the service module C slightly ahead until he senses that contact has been made at both ends of the lifting bar 5. When this proper orientation has been achieved, the locking mechanism can be activated to lift and lock the service module C to the service vehicle B.
- the upper curved contour of the C-shaped attachment means 2 is an arc about the pivot center of lifting bar link 10. This configuration facilitates proper engagement between the lifting bar 5 and the lifting hook 3 when the locking mechanism is activated while the service vehicle is in a standing position.
- the relative position of the lifting and holding bars 5 and 6 and of the attachment means 2 defines the position of the service module C with respect to the service vehicle B to provide traveling clearances between the module C and the ground. This relative position can be changed depending on the contour of the attachment means 2 and/or the location of the lifting and holding bars 5 and 6.
- the locking mechanism of the present invention reduces the normal distance from the center line of the front axle to the center of gravity of the load.
- the present invention provides an automatic locking mechanism which is part of a standardized mining service vehicle and can be used to attach an unlimited variety of service modules to the vehicle.
- the locking mechanism can pick up a service module lying askew in front of the mining vehicle without the necessity of a conventional loader boom and tilt cylinders for aligning the mechanism with the module.
- the locking mechanism rigidly secures the module to the vehicle even in the event of hydraulic failure and even though there may be loose or worn pins in the linkage assembly.
- destructive impacts on the module, the vehicle and the locking mechanism are eliminated when the vehicle bounces over often-encountered rough terrain.
- the locking mechanism makes it possible to pick up or drop off a module without manual attention. The vehicle operator can perform these tasks from the vehicle operating station.
- the locking mechanism is also designed to allow the service module to be carried close to the front axle of the service vehicle. This allows the service vehicle to handle heavier modules than can be handled by the same vehicle equipped with a conventional loader boom and hitching assembly.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Shovels (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Vehicle Body Suspensions (AREA)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/060,267 US4265587A (en) | 1979-07-25 | 1979-07-25 | Quick-coupling locking mechanism |
GB8107294A GB2071199A (en) | 1979-07-25 | 1980-07-22 | Quick-coupling locking mechanism |
PCT/US1980/000957 WO1981000269A1 (en) | 1979-07-25 | 1980-07-22 | Quick-coupling locking mechanism |
AU6887180A AU6887180A (US07118763-20061010-C00002.png) | 1979-07-25 | 1980-07-22 | |
AU62271/80A AU6227180A (en) | 1979-07-25 | 1980-07-22 | Quick-coupling locking mechanism |
DE803049721A DE3049721A1 (en) | 1979-07-25 | 1980-07-22 | Quick-coupling locking mechanism |
FR8016511A FR2470027A1 (fr) | 1979-07-25 | 1980-07-25 | Mecanisme de verrouillage a accouplement rapide pour vehicule de servitude d'exploitation de mines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/060,267 US4265587A (en) | 1979-07-25 | 1979-07-25 | Quick-coupling locking mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US4265587A true US4265587A (en) | 1981-05-05 |
Family
ID=22028431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/060,267 Expired - Lifetime US4265587A (en) | 1979-07-25 | 1979-07-25 | Quick-coupling locking mechanism |
Country Status (6)
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4400994A (en) * | 1981-02-11 | 1983-08-30 | Kverneland A/S | Hinge assembly |
US4480955A (en) * | 1981-02-05 | 1984-11-06 | Maroochy Shire Council | Coupling for earth moving tools etc. |
GB2169582A (en) * | 1985-01-15 | 1986-07-16 | Samuel Trevor Mason | Quick-change fitting for load shifting implement |
US6209231B1 (en) | 1998-08-14 | 2001-04-03 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6363629B1 (en) | 2000-02-18 | 2002-04-02 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
EP1074664A3 (de) * | 1995-08-16 | 2002-04-03 | Deere & Company | Bagger |
US6381880B1 (en) | 1998-08-14 | 2002-05-07 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6499904B2 (en) | 2001-01-19 | 2002-12-31 | Nye Manufacturing Ltd. | Excavator coupler using fluid operated actuator |
US6526677B1 (en) | 2000-10-06 | 2003-03-04 | Douglas Dynamics, L.L.C. | Snowplow mounting assembly |
EP1375314A1 (en) * | 2002-06-18 | 2004-01-02 | Dana Corporation | Modular body and frame assembly for a vehicle |
US20040104253A1 (en) * | 2002-01-17 | 2004-06-03 | Bieker Stephen P. | Portable fluid-transporting system |
US6848748B2 (en) * | 2000-09-20 | 2005-02-01 | Dbt Gmbh | Mining system with drilling, loading, conveyor, and support |
US20050111951A1 (en) * | 2003-11-10 | 2005-05-26 | Branham Dana D. | Linkage assembly restraint |
US20060055150A1 (en) * | 2003-09-29 | 2006-03-16 | Ltt Biio-Phara Co., Ltd | Vehicle mount assembly for a utilitarian accessory |
US20130000437A1 (en) * | 2010-04-06 | 2013-01-03 | Kongsberg Automotive Ab | Shift fork assembly |
US10113301B2 (en) * | 2014-09-12 | 2018-10-30 | Brokk Aktiebolag | Arrangement for the removable coupling of a tool with a manoeuvrable arm of a working machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU544156B2 (en) * | 1980-11-17 | 1985-05-16 | Eimco (Great Britain) Ltd. | A coupling system for earth-moving equipment |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA814808A (en) * | 1969-06-10 | S. Antolini Henry | Earth moving equipment | |
US3818551A (en) * | 1973-02-27 | 1974-06-25 | Rome Industries | Quick hitch assembly |
US3935953A (en) * | 1974-06-24 | 1976-02-03 | Caterpillar Tractor Co. | Implement mounting means for earthworking vehicles |
US4013182A (en) * | 1975-04-21 | 1977-03-22 | Rockland, Inc. | Detachable coupling system |
US4068959A (en) * | 1976-11-26 | 1978-01-17 | Pemberton Bruce W | Coupler apparatus |
US4116346A (en) * | 1976-02-24 | 1978-09-26 | Caterpillar Mitsubishi Ltd. | Quick coupler |
US4116347A (en) * | 1976-02-03 | 1978-09-26 | Caterpillar Mitsubishi Ltd. | Quick coupler |
US4204794A (en) * | 1977-07-18 | 1980-05-27 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for attaching implement to earth moving vehicle |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3760883A (en) * | 1972-03-27 | 1973-09-25 | Balderson Inc | Quick hitch assembly |
US4116437A (en) * | 1973-02-08 | 1978-09-26 | Johnson Neil E | Tennis training and rating apparatus |
DE2734972C2 (de) * | 1977-08-03 | 1982-06-09 | O & K Orenstein & Koppel Ag, 1000 Berlin | Vorrichtung zum Verbinden von serienmäßigen auswechselbaren Anbauwerkzeugen |
-
1979
- 1979-07-25 US US06/060,267 patent/US4265587A/en not_active Expired - Lifetime
-
1980
- 1980-07-22 AU AU6887180A patent/AU6887180A/xx active Pending
- 1980-07-22 DE DE803049721A patent/DE3049721A1/de not_active Withdrawn
- 1980-07-22 AU AU62271/80A patent/AU6227180A/en not_active Abandoned
- 1980-07-22 WO PCT/US1980/000957 patent/WO1981000269A1/en active Application Filing
- 1980-07-22 GB GB8107294A patent/GB2071199A/en not_active Withdrawn
- 1980-07-25 FR FR8016511A patent/FR2470027A1/fr not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA814808A (en) * | 1969-06-10 | S. Antolini Henry | Earth moving equipment | |
US3818551A (en) * | 1973-02-27 | 1974-06-25 | Rome Industries | Quick hitch assembly |
US3935953A (en) * | 1974-06-24 | 1976-02-03 | Caterpillar Tractor Co. | Implement mounting means for earthworking vehicles |
US4013182A (en) * | 1975-04-21 | 1977-03-22 | Rockland, Inc. | Detachable coupling system |
US4116347A (en) * | 1976-02-03 | 1978-09-26 | Caterpillar Mitsubishi Ltd. | Quick coupler |
US4116346A (en) * | 1976-02-24 | 1978-09-26 | Caterpillar Mitsubishi Ltd. | Quick coupler |
US4068959A (en) * | 1976-11-26 | 1978-01-17 | Pemberton Bruce W | Coupler apparatus |
US4204794A (en) * | 1977-07-18 | 1980-05-27 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for attaching implement to earth moving vehicle |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4480955A (en) * | 1981-02-05 | 1984-11-06 | Maroochy Shire Council | Coupling for earth moving tools etc. |
US4400994A (en) * | 1981-02-11 | 1983-08-30 | Kverneland A/S | Hinge assembly |
GB2169582A (en) * | 1985-01-15 | 1986-07-16 | Samuel Trevor Mason | Quick-change fitting for load shifting implement |
EP1074664A3 (de) * | 1995-08-16 | 2002-04-03 | Deere & Company | Bagger |
US6594924B2 (en) | 1998-08-14 | 2003-07-22 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6209231B1 (en) | 1998-08-14 | 2001-04-03 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6381880B1 (en) | 1998-08-14 | 2002-05-07 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6408546B2 (en) | 1998-08-14 | 2002-06-25 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6363629B1 (en) | 2000-02-18 | 2002-04-02 | Curtis International, Inc. | Vehicle hitch mount assembly for a snow plow |
US6848748B2 (en) * | 2000-09-20 | 2005-02-01 | Dbt Gmbh | Mining system with drilling, loading, conveyor, and support |
US6711837B2 (en) | 2000-10-06 | 2004-03-30 | Douglas Dynamics, L.L.C. | Snowplow mounting assembly |
US6526677B1 (en) | 2000-10-06 | 2003-03-04 | Douglas Dynamics, L.L.C. | Snowplow mounting assembly |
US6928757B2 (en) | 2000-10-06 | 2005-08-16 | Douglas Dynamics, L.L.C. | Snowplow mounting assembly |
US20050120595A1 (en) * | 2000-10-06 | 2005-06-09 | Douglas Dynamics, L.L.C. | Snowplow mounting assembly |
US6499904B2 (en) | 2001-01-19 | 2002-12-31 | Nye Manufacturing Ltd. | Excavator coupler using fluid operated actuator |
US20050155993A1 (en) * | 2002-01-17 | 2005-07-21 | Bieker Stephen P. | Portable fluid-transporting system |
US6889877B2 (en) * | 2002-01-17 | 2005-05-10 | Stephen P. Bieker | Portable fluid-transporting system |
US20040104253A1 (en) * | 2002-01-17 | 2004-06-03 | Bieker Stephen P. | Portable fluid-transporting system |
US7520411B2 (en) | 2002-01-17 | 2009-04-21 | Bieker Stephen P | Portable fluid-transporting system |
US6817655B2 (en) | 2002-06-18 | 2004-11-16 | Dana Corporation | Modular body and frame assembly for a vehicle |
EP1375314A1 (en) * | 2002-06-18 | 2004-01-02 | Dana Corporation | Modular body and frame assembly for a vehicle |
US20060055150A1 (en) * | 2003-09-29 | 2006-03-16 | Ltt Biio-Phara Co., Ltd | Vehicle mount assembly for a utilitarian accessory |
US20050111951A1 (en) * | 2003-11-10 | 2005-05-26 | Branham Dana D. | Linkage assembly restraint |
US7056079B2 (en) | 2003-11-10 | 2006-06-06 | Caterpillar Inc. | Linkage assembly restraint |
US20130000437A1 (en) * | 2010-04-06 | 2013-01-03 | Kongsberg Automotive Ab | Shift fork assembly |
US9097339B2 (en) * | 2010-04-06 | 2015-08-04 | Kongsberg Automotive Ab | Shift fork assembly |
US10113301B2 (en) * | 2014-09-12 | 2018-10-30 | Brokk Aktiebolag | Arrangement for the removable coupling of a tool with a manoeuvrable arm of a working machine |
Also Published As
Publication number | Publication date |
---|---|
WO1981000269A1 (en) | 1981-02-05 |
FR2470027A1 (fr) | 1981-05-29 |
AU6887180A (US07118763-20061010-C00002.png) | 1981-02-13 |
DE3049721A1 (en) | 1982-03-04 |
AU6227180A (en) | 1981-02-13 |
GB2071199A (en) | 1981-09-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: TAMROCK WORLD CORPORATION N.V., C/O PIERSON, HELDR Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ENVIROTECH CORPORATION;REEL/FRAME:005252/0145 Effective date: 19890731 |
|
AS | Assignment |
Owner name: EIMCO COAL MACHINERY, INC., WEST VIRGINIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAMROCK WORLD CORPORATION, N.V.;REEL/FRAME:006817/0690 Effective date: 19930927 |